Wagon-jack.



A. A. GON.

WAGON JACK.

APPLICATION FILED 11111.24, 1911.

PatentedvDec. 26, 1911.

J Moms.

cnLUMsIA PLANDGRAPM C0.. WASHINGTON n r ALBERT A. COON, OFVHUTSONVILLE, ILLINOIS.

WAGON-JACK.

Speccaton of Letters Patent.

Patented Dec. 26, 1911.

Application led January 24, 1911. Serial No. 604,445.

To @ZZ whom tt 'may concern:

nBe it known that I, ALBERT A. CooN, citizen of the United States, residing at Hutsonville, in the county of Crawford and State of Illinois, have invented certain new and useful Improvements in VVagonJacks, of which the following is a specification.

This invention relates to hoisting apparatus and particularly to hand-operated lifting jacks of the kind usually employed when wagon wheels are greased.

The primary object of the invention to provide a lifting jack of a very efficient, simple and durable construction having a wide range of movement and provided with means whereby the lifting bar may be readily and quickly adjusted to accommodate various conditions and in which the lifting bar is automatically locked at any height desired.

Another object of the invention is to 1mprove the form of jack claimed in my Patent Number 951,057 of March 1, 1910, the improvement consisting in so arranging the various parts that the fulcrum of the lifting lever is set relatively low down upon the supporting post whereby a more solid support is secured for the wagon and whereby the lever may be easily operated by the foot of the operator. Furthermore, this 'disposition of the lifting lever is of advantage in placing the jack beneath the wagon or in carrying the jack.

A further object is to so form the jack that the lifting bar is pivotally supported at both ends and is held away from the face of the supporting post and out of frictional contact therewith.

A still further object is to provide a lifting lever to which an auxiliary lever may be applied when an especially heavy weight is to be raised, and further to provide the jack with a locking clamp for the liftinglever, which clamp not only automatically locks the lifting lever to any desired height but which clamp may be turned up so as to provide a handlewhereby the jack may be carried.

Other objects of the invention will be brought out in the following specification.

The invention is illustrated in the accompanying drawings wherein:

Figure 1 is a perspective view of my improved lifting jack. Fig. 2 is a fragmentary side elevation thereof, the foot on the lifting bar being in section. Fig. 3 is a perspective detail view of the clutch.

Referring to .these figures, 2 designates the supporting post of the lifting jack which may be of any suitable material and of any desired height. This supporting post is mounted upon a base which preferably consists of the parallel sills 3 disposed on each side of the supporting post'and spaced from each other. l Passing through the supporting post, somewhat below its middle, is the lever fulcrum 4 upon which the lifting lever 5 is mounted. This lever is preferably formed of two parallel bars 6 dispo-sed, one on each side of the post 2 and spaced from each other in any suitable manner. |The handle ends of these bars 6 are preferably connected and the other extremity of the bars 6 are con nected by a pivot bolt 7. The lifting bar 8 is disposed between the bars 6 forming the lever 5 and is pivoted thereto by the bolt 7.

At its upper end the lifting bar is pivotally connected to the upper end of the post 2 by means of the links 10, these links being pivoted to the post at 11 and to the lifting bar 8 by the pin 12. The lifting bar 8 is provided with a plurality of notches 9 for engagement with a sliding foot 13. This foot 13 is formed with an elongated slot 14 which is closed at one end by the transverse bar 15. This transverse bar 15 may be formed in one piece with the foot or separately attached thereto and is adapted to engage with any one of the notches 9. This construction permits the foot 13 to be shifted1 up or down upon the lifting bar 8 to any desired position. It will be obvious that when weight is' placed upon the foot that the transverse member 15 will engage in the notches and hold the foot firmly to the lifting bar.

In order to brace the post 2 I provide the upwardly extending braces 16 which are attached at their lower ends to a transverse bolt or like member passing through the sills 3 and at their upper ends are connected to the fulcrum lever 4 or the lifting lever 5.

Pivotally mounted between the sills 3, as Y 'upon a transverse bolt, is the upwardly the bolt 23.

55 strength to the post.

the bars 6. The clamp 18 is formed at its middle with an elongated or elliptical slot 20 through which Vthe bar 17 passes and the extremity of the clamp is upwardly ex- 5 tended as at 21 and then angularly bent as l0 with the transversely extending bolt or member 23. An auxiliary lever 24 may be inserted, as illustrated in dotted lines, through the end of the lever 5, the inner end of the auxiliary lever 24 bearing against By this means additional leverage can be secured upon the lifting lever 5.

The operation of my invention is as follows. In order to lower the lifting bar 8,

20 the handle 22 of the clutch is elevated to the position shown in Fig. 2. The lift applied to the handle 22 releases the clutch from its engagement with the rod 17 and raises the handle at the same time lowering the lift- 25 ing bar 8. The sliding foot 13 is now inserted beneath the axle or other object to be lifted. The clutch handle is now let go whereupon the weight of t-he lever will cause the lifting bar to be raised until the 30 foot is in engagement with the object to be lifted. As the lever 5 is depressed, the gravity clutch or clamp slides down the rod 17 and automatically locks upon the rod 17 whenever the downward pressure upon the lever 5 is relieved, thus preventing the lever rising. When it is desired to lower the jack, the handle 22 of the clutch or clamp is lifted as before described, thus releasingl its engagement with the rod 17, permitting the outer end of the lever 5 to be raised.

A jack constructed in accordance with my invention can be made of very light material; is of suicient strength to support parn zticularly heavy loads and has a much greater llifting power than the jack described in my 1vprevious patents.

As the lifting bar 8 is supported away from the face of the supporting post 2 and is pivotally supported at both ends, there is `no friction and the lifting bar does not tend to jam against the face of the post, as in my former patent before referred to.

The position of the fulcrum below the Ymiddle of the post gives great additional The p ost does not tend to buckle or spring. Furthermore, the fulcrum bolt 4 passes through the post, through the bars 6 forming the lever 5 and through the braces 16, thus giving a very irm and solid bearing to the fulcrum bolt. By placing the fulcrum 4 nearer .to the base than in my former construction, I provide a construction wherein the lever may be operated by foot power as well as by hand power and thus the whole weight of the body used in operating the lever. Another point to be observed is that when elevated, the lever does not extend higher than the top of the post nor higher than the top of the lifting bar 8. This permits the lifting jack to be placed under vehicles where if the lifting lever projected beyond the top of the post it would be impossible to use the jack. As the base is formed of two parallel sills spaced from each other, it gives a much more solid foundation for the post and also readily adapts itself to uneven ground or to a gravel surface, whereas a flat base would set unevenly.

In Fig. 2 I have illust-rated the position of the clamp 18 when it is turned up so that the angular extremity 22 forms a handle whereby the jack as a whole may be lifted. This is of great convenience where many wheels are to be greased or where a lifting jack has to be carried.

What I claim is:

A jack comprising a base, a support mounted thereon, a lifting member pivoted upon the support, a lever fulcrumed upon the support and operatively connected with the lifting member, a rod pivoted upon the base at the side of the support and having an angularly disposed end portion, a locking clamp pivoted upon the lever at a point beyond the side of the support and having sliding engagement with the rod, said clamp having an angularly disposed end portion adapted to bear against the side of the supucrt at a point above the lever, said end portion being of greater length than the distance from the support to the pivotal point of the clamp.

In testimony whereof, I afiix my signature 1n presence of two witnesses.

ALBERT A. COON.

Witnesses:

WILLIAM CooN, Jol-IN F. HARRIS.

Copies of this patent may 'be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. v 

